General-Purpose Small-Angle Neutron Scattering Diffractometer
| Beam Spectrum: | Cold |
| Monochromators: | Helical slot selector |
| Incident wavelength: | 4 < λ < 30 Å |
| Resolution Range: | Δλ ⁄ λ 0.09 – 0.45% |
| Collimation: | Eight removable guide sections, each 4 × 4 cm2 and 2 m long; 2-m open area at sample stage to mount automatic changers, furnaces, magnets, cryostats, pressure cells, etc. |
| Q range (Å-1) | |
| 1.5-m collimation: | 0.038 < Q < 1.0 Å-1 (5 Å); 0.019 < Q < 0.50 Å-1 (10 Å) |
| 20 m collimation: | 0.004 < Q < 0.074 Å-1 (5 Å); 0.002 < Q < 0.037 Å-1 (10 Å) |
| Sample detector distances: | 1 < D < 20 m |
| Detector: | 2-D (3He) position-sensitive detector with 1-m2 active area and 5.1 × 5.1 mm2 pixels |
| Max counting rate: | 200 kHz |
The General-Purpose SANS instrument is optimized for providing information about structure and interactions in materials in the size range of 0.5 – 200 nm. It will have cold neutron flux on sample and capabilities comparable to those of the best SANS instruments worldwide, including a wide range of neutron wavelengths λ 5 – 30 Å, resolution Δλ ⁄ λ 9.45%, and a 1-m2 area detector with 5- × 5-mm2 pixel resolution with a maximum counting capability of up to 200 kHz. The sample-to-detector distance can be varied from 1 to 20 m, and the detector can be offset horizontally by up to 45 cm, allowing a total accessible Q range of from <0.001 to 1 Å-1. The 2-m sample environment area will accommodate large, special-purpose sample environments such as cryomagnets, furnaces, mechanical load frames, and shear cells.
CG-2 Schematic
Applications
Soft condensed matter: molecular self-assembly and interactions in complex fluids; intermediate order in glassy systems, polymer solutions, gels and blends, colloids, micelles, and microemulsions.
Hard condensed matter: phase separation, grain growth, and orientation in metallurgical alloys, nanocomposites, advanced ceramics, and porous catalytic and adsorbent materials.
Magnetic systems: flux lattices in superconductors, ferrofluids, and the relationship between structural and magnetic domains and ordering.
